Refer to Figure 15.10a. For the braced cut, given H 5 8 m; Hs 5 3 m; gs 5 17.5 kN/m3 ; angle of friction of sand, f9 s 5 348; Hc 5 5 m; gc 5 18.2 kN/m3 ; and unconfined compression strength of clay layer, qu 5 55 kN/m2 . a. Estimate the average cohesion scavd and average unit weight sgavd for the construction of the earth-pressure envelope. b. Plot the earth-pressure envelope.

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